JPH07130252A - Operating mechanism for switchgear - Google Patents

Abstract

PURPOSE:To provide high deceleration and further to prevent an operating mechanism from moving even when turning force is applied from an output shaft, in the operating mechanism used in a switchgear. CONSTITUTION:An output shaft 2 is turnably held in a frame 1. A sliding cylinder 4 formed respectively asymmetrically with lead grooves 11, 12, having a load angle in the peripheral symmetrical surface, is secured to the output shaft 2. A inner cylinder 6, formed respectively with linear slit grooves 7, 8 in the peripheral symmetrical surface, is fixedly supported on the frame 1 in the inside of the sliding cylinder 4. A lifter 9, having an internal thread part in the center part, is fitted to the linear slit grooves 7,8 of the inner cylinder 6. A roller 5 is respectively rotatably supported to both end parts of the lifter 9 and further respectively fitted to the lead grooves 11, 12 of the sliding cylinder 4. An input screw bar 10 rotated by an electric motor 3, having an external thread part screwed to the internal thread part of the lifter 9, is arranged rotatably relative to the inner cylinder 6 and the sliding cylinder 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operating mechanism used in a switchgear.

[0002]

2. Description of the Related Art Generally, an operating mechanism having a speed reducer composed of meshing gears is required to achieve high speed reduction, and therefore gears having a large difference in the number of teeth are combined.

2A and 2B show an example of such a conventional operating mechanism for a switchgear, in which FIG. 2A is a plan view and FIG. 2B is a front view. In the figure, a large gear 13 having a rotation stopping hole 21 is fixed to an output shaft 2 rotatably supported by a frame 1. The large gear 13 meshes with a small gear 14 fixed to an input shaft 15 rotatably supported by the frame 1. The input shaft 15 is connected to the output shaft of the speed reducer 22 via a coupling 23, and the speed reducer 22 is directly connected to the electric motor 3. The L-shaped lever 17 operates with a lever pin 16 fixedly supported by the frame 1 as a fulcrum, and one end of the L-shaped lever 17 via a plunge 19 and a spring 18.
It is connected to the solenoid 20 fixed to.

In the above operating mechanism, the L-shaped lever 1 is normally operated, that is, when the opening / closing device is not operated.
By fitting one end of 7 into the rotation stop hole 21 of the large gear 13, the large gear 13 is locked so that the input shaft 15 does not rotate even if rotational force is applied from the output shaft 2 side. . When the opening / closing operation of the opening / closing device is performed, the solenoid 20 is excited by an electric command, the spring 18 is compressed, the plunger 19 is attracted, and the L-shaped lever 17 is used as a fulcrum to stop the large gear 13. It is pulled out from the hole 21 and the lock of the large gear 13 is released. When the electric motor 3 rotates, the rotational force reduced by the speed reducer 22 is transmitted to the small gear 14 fixed to the input shaft 15 via the coupling 23, and the small gear 14 meshes with the large gear 13 to further reduce the speed. Then, the rotational force is transmitted to the output shaft 2.

[0005]

However, in this conventional operating mechanism for a switchgear, the number of teeth is increased in order to achieve high deceleration and prevent the operating mechanism from moving due to the rotational force from the output shaft 2 side. Since a combination of the small gear 14 and the large gear 13 having a large difference and a lock mechanism that prevents the output shaft 2 from rotating even if a rotational force is applied, the operation mechanism becomes large and complicated. . Therefore, the present invention provides high deceleration with a simple mechanism and prevents the operating mechanism for the opening / closing device from moving due to the rotational force from the output shaft side without increasing the size.

[0006]

In the operating mechanism for the opening / closing device of the present invention, an output shaft rotatably held by the frame is provided. Lead grooves having lead angles are formed asymmetrically on the outer peripheral symmetry plane, and a sliding cylinder fixed to the output shaft is provided. A straight slit groove is formed on each of the outer peripheral symmetrical surfaces, and an inner cylinder fixedly supported by the frame is provided. An elevating body having a female screw portion in the central portion and fitted in the slit groove of the inner cylinder is provided. Rollers rotatably supported at both ends of the lifting body and fitted in the lead grooves of the sliding cylinder are provided. An input screw rod that has a male screw portion that is screwed into the female screw portion of the lifting body and that is rotated by an electric motor is provided.

[0007]

In the operating mechanism for the opening / closing device of the present invention, the lifting body moves upward or downward by the rotation of the input screw rod by the electric motor, and thereby the output shaft rotates integrally with the sliding cylinder. It is possible to achieve large deceleration and high deceleration. Also,
Even if a rotational force is applied from the output shaft side, the lifting shaft fits in the linear slit groove of the inner cylinder, and the roller of the lifting body fits in the lead groove of the sliding cylinder. do not do.

[0008]

FIG. 1 shows an embodiment of the present invention.
(A) is a front view, (B) is a plan view seen from the direction of arrow AA in (A), and (C) is a cross-sectional view of the switchgear in a closed state. In FIG. 1, the output shaft 2 is a frame 1.
It is rotatably held. The sliding cylinder 4 in which the lead grooves 11 and 12 each having a lead angle on the outer peripheral symmetrical surface are formed asymmetrically is fixed to the output shaft 2. The inner cylinder 6 in which the linear slit grooves 7 and 8 are formed on the outer peripheral symmetrical surface is fixedly supported by the frame 1 inside the sliding cylinder 4. The elevating body 9 has a female screw portion at the center thereof, and the linear slit groove 7 of the inner cylinder 6,
8 is fitted. Rollers 5 are rotatably supported at both ends of the lifting body 9 and are fitted in the lead grooves 11 and 12 of the sliding cylinder 4, respectively. The input screw rod 10 rotated by the electric motor 3 has a male screw portion that is screwed into the female screw portion of the lifting body 9, and is rotatably arranged with respect to the inner cylinder 6 and the sliding cylinder 4.

Next, the operation of the above-mentioned operating mechanism of the present invention will be described. In a normal state, that is, when the opening / closing operation of the opening / closing device is not performed, the lifting body 9 is fitted in the linear slit grooves 7 and 8 of the inner cylinder 6 even if a rotational force is applied from the output shaft 2 side, and the roller of the lifting body 9 is 5 is fitted in the lead grooves 11 and 12 of the sliding cylinder 4, the output shaft 2 does not rotate. FIG. 1C shows the state of the operating mechanism when the switchgear is in the closed state. When performing the closing operation, when the input screw rod 10 is rotated by the electric motor 3, the elevating body 9 moves into the inner cylinder. It moves upward in the straight slit grooves 7 and 8 of 6. At this time, the rollers 5 on both ends of the lifting body 9 are connected to the lead grooves 11, 12 of the sliding cylinder 4.
Move while rotating inside. As a result, the sliding cylinder 4 rotates counterclockwise, the output shaft 2 also rotates counterclockwise, and the opening / closing device is opened. On the other hand, when the circuit closing operation is performed, the input screw rod 10 is rotated by the electric motor 3 in the direction opposite to the circuit opening operation, whereby the elevating body 9 moves downward and slides in the opposite manner to the circuit opening operation. Tube 4 and output shaft 2
Is rotated clockwise.

[0010]

According to the present invention, the lifting body moves upward or downward by the rotation of the input screw rod by the electric motor, and thereby the output shaft rotates integrally with the sliding cylinder, so that a large reduction ratio can be obtained. High deceleration is possible, and it is not necessary to combine a small gear and a large gear with a large difference in the number of teeth. Further, even if a rotational force is applied from the output shaft side, the lifting body fits in the linear slit groove of the inner cylinder, and the roller of the lifting body fits in the lead groove of the sliding cylinder. It does not rotate and the locking device is unnecessary.

[Brief description of drawings]

1A and 1B show an embodiment of an operating mechanism for a switchgear according to the present invention, in which FIG. 1A is a front view and FIG. 1B is AA in FIG.
The top view seen from the arrow direction, (C) is sectional drawing in the closed state of a switchgear.

FIG. 2 shows an example of a conventional operating mechanism for a switchgear, in which (A) is a plan view and (B) is a front view.

[Explanation of symbols]

 1 Frame 2 Output Shaft 3 Electric Motor 4 Sliding Cylinder 5 Roller 6 Inner Cylinder 7 Straight Slit Groove 8 Straight Slit Groove 9 Elevator 10 Input Screw Rod 11 Lead Groove 12 Lead Groove

Claims (1)

[Claims] 1. An output shaft rotatably held by a frame, a lead groove having a lead angle on an outer peripheral symmetry surface, and a sliding cylinder fixed to the output shaft, and an outer peripheral symmetry surface. An inner cylinder fixedly supported by the frame, a linear slit groove formed in each of the inner cylinder, an elevating body having a female screw portion in the center and fitted in the slit groove of the inner cylinder, and both ends of the elevating body. A roller that is rotatably supported by the section and that is fitted into the lead groove of the sliding cylinder; and an input screw rod that has a male screw portion that is screwed into the female screw portion of the elevating body and that is rotated by an electric motor. An operating mechanism for a switchgear, comprising: